How many valence electrons are in an atom of magnesium

Asked by maham237 @ 09/01/2021 in Chemistry viewed by 317 People

How many valence electrons are in an atom of magnesium? (atomic number 12)?

Answered by maham237 @ 09/01/2021

From the periodic table, Magnesium is actually the element 12
and this belongs to Group 2. We know that an element in Group 2 has 2 valence electrons.

We can also determine this from the electron configuration of
Mg which is 1s² 2s²2p⁶ 3s² or
[Ne]3s². Since the outermost electron is 3s² therefore magnesium has 2 valence electrons.

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